ACTA ENTOMOLOGICA MUSEI NATIONALIS PRAGAE Published 30.iv.2014 Volume 54(1), pp. 157–194 ISSN 0374-1036 http://zoobank.org/urn:lsid:zoobank.org:pub:9CC5EBA3-8351-4C89-B9B2-0D84C17BBF0B Taxonomy and biology of the bromeliad-inhabiting genus Lachnodacnum (Coleoptera: Hydrophilidae: Sphaeridiinae) Bruno CLARKSON1), Fabiano Fabian ALBERTONI2) & Martin FIKÁýEK3,4) 1) Programa de Pós-Graduação em Zoologia, Museu Nacional, Laboratório de Entomologia, Departamento de Zoologia, Instituto de Biologia, Universidade Federal do Rio de Janeiro, Caixa Postal 68044, 21941–971, Rio de Janeiro, RJ, Brasil; e-mail:
[email protected] 2) Programa de Pós-Graduação em Sistemática, taxonomia animal e biodiversidade, Entomologia, Museu de Zoologia da Universidade de São Paulo, Av. Nazaré, 481, Ipiranga, CEP 04263-000, São Paulo, SP, Brasil; e-mail:
[email protected] 3) Department of Entomology, National Museum in Prague, Kunratice 1, CZ-148 00 Praha 4, Czech Republic; e-mail: m¿
[email protected] 4) Department of Zoology, Faculty of Science, Charles University in Prague, Viniþná 7, CZ-128 44 Praha 2, Czech Republic Abstract. The water scavenger beetle genus Lachnodacnum Orchymont, 1937 sensu HANSEN (1991) is revised. The three species that had previously been placed in the genus, L. luederwaldti Orchymont, 1937 (southern Brazil), L. saundersi Orchymont, 1937 (northern Brazil) and L. urichi (Scott, 1912) (Trinidad and Tobago), are redescribed in detail and illustrated with habitus photographs, line drawings, and SEM micrographs of relevant diagnostic characters. Lachnodacnum urichi is found not to be congeneric with the remaining two species. It is transferred to the genus Phaenostoma Orchymont, 1937 (as P. urichi (Scott, 1912) comb.